After pre-coding bit data of address information to be recorded on an optical disc on the basis of at least 4 wobble units, wobble data pre-coded on at least 4 wobble units is modulated by a BPSK (Binary Phase Shift Keying) or ASK (Amplitude Shift Keying) method, and the modulated wobble data is alternately recorded on both sides of a land and/or groove of the optical disc. As a result, wobble signals, recorded on sides of signal tracks of a groove and a land, in consecutively repeated anti-phase, or having consecutively repeated different amplitudes, are avoided. There are no consecutively repeated zero-level sections in a push-pull signal, thereby minimizing performance degradation of a wobble PLL (Phase-Locked Loop) and a noise generated in a reproduction RF signal.
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8. An optical disc including wobble signals recorded in signal track, characterized in that “0” and “1” bit data of address information is pre-coded on the basis of at least 4 wobble units, and the pre-coded data is modulated and recorded as a modulated wobble data on a land and/or a groove of the optical disc,
wherein pre-coded data representing “0” and “1 bit data of address information has at least two same values and at least one different value at respective wobble units.
1. A method for recording wobble signals on an optical disc, comprising the steps of:
a) pre-coding “0” and “1” bit data of address information, to be recorded on the optical disc, on the basis of at least 4 wobble units, respectively; and
b) modulating the pre-coded wobble data and alternately recording the modulated wobble data on a land and/or groove of the optical disc;
wherein the pre-coded wobble data representing “0” and “1” bit data of address information has at least two same values and at least one different value at respective wobble units, thereby distinguishing “0” bit data from “1” bit data.
15. A device for recording wobble signals on an optical disc, comprising:
a pre-coder configured to pre-code “0” and “1” bit data of address information, to be recorded on the optical disc, on the basis of at least 4 wobble units, respectively;
a modulator configured to modulate the pre-coded wobble data; and
a recording unit configured to alternately record the modulated wobble data on a land and/or groove of the optical disc,
wherein the pre-coded wobble data representing “0” and “1” bit data of address information has at least two same values and at least one different value at respective wobble units, thereby distinguishing “0” bit data from “1” bit data.
2. The method as set forth in
3. The method as set forth in
4. The method as set forth in
5. The method as set forth in
6. The method as set forth in
7. The method of
9. The method as set forth in
10. The optical disc of
11. The optical disc of
12. The optical disc of
13. The optical disc of
14. The optical disc of
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1. Field of the Invention
The present invention relates to an optical disc.
2. Description of the Related Art
Generally, optical discs being recording mediums for recording information such as video data, audio data, etc. are widely used. In addition to commercialized CDs (Compact Discs) as the optical discs, read-only optical discs such as a CD-ROM (Compact Disc-Read Only Memory), a DVD-ROM (Digital Versatile Disc-Read Only Memory), etc., write-once optical discs such as a CD-R (Compact Disc-Recordable), a DVD-R (Digital Versatile Disc-Recordable), etc., and rewritable optical discs such as a CD-RW (CD-Rewritable), a DVD-RAM (Compact Disc-Random Access Memory), a DVD-RW (DVD-Rewritable), etc. are currently supplied and developed.
Identification information containing address information, etc. is written on the rewritable optical disc so that data is written in a desired write location. As shown in
The address information is read from a wobble signal of the signal track 12 of the wobbled groove as described above, and data can be recorded on a specific location of the optical disc based on the read address information.
However, because the address information is recorded on only the signal track of the groove in a conventional optical disc, recording capacity for the address information is limited.
On the other hand, as an optical disc capable of recording the address information on both signal tracks of the land and the groove, an optical disc shown in
However, because data that a user desires to record cannot be recorded on the header fields made up of the pre-pit arrays 14 in the above-described optical disc, recording capacity for user data is limited.
On the other hand, a method for maximizing recording capacity by allowing the address information as wobble signals to be recorded on both signal tracks of the land and the groove is proposed. The method will be described in detail.
First, referring to
On the other hand, the signal tracks 20 and 22 of lands and grooves include a pair of sides, wobbled in phase, corresponding to an in-phase wobbled portion 24A and another pair of sides, wobbled in anti-phase, an anti-phase wobbled portion 24B, wherein the pairs are alternately formed. The in-phase wobbled portion 24A and the anti-phase wobbled portion 24B are alternated in a width direction of the signal track.
Further, hatched in-phase wobbled portions 24A have the identification information containing the address information, etc. pre-formatted on both sides of each portion 24A. The identification information is wobbled according to a frequency-modulated carrier signal. The in-phase wobbled portions 24A and the anti-phase wobbled portions 24B are alternately arranged in traveling and width directions of the signal tracks 20 and 22. Both sides of each anti-phase wobbled portion 24B are wobbled in different phases.
Accordingly, the address information is obtained from a wobble signal on the in-phase wobbled portion 24A. For example, as shown in
In a recording medium based on the above-described manner, information can be recorded on all the signal tracks of the lands and the grooves. Accordingly, all recordable portions of the recording medium can be utilized.
However, in a method for recording a wobble signal on each of the signal tracks of the land and the groove, one period signal is allocated to one bit of the address information. Because the signal is phase-modulated and the phase-modulated signal is recorded, a valid address or an invalid address can be detected according to a tracking state of an optical pickup.
For example, as shown in
Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for recording wobble signals on an optical disc, the method being capable of recording wobble signals being address information on both sides of a signal track of a groove or land of the optical disc so that a push-pull signal does not have consecutively repeated zero-level sections when the optical disk is reproduced.
It is another object of the present invention to provide an optical disc on which wobble signals, being address information on both sides of a signal track of a groove or land of the optical disc, are recorded so that a push-pull signal does not have consecutively repeated zero-level sections when the optical disk is reproduced.
In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of a method for recording wobble signals on a optical disc, comprising the steps of: a) pre-coding bit data of address information, to be recorded on the optical disc, on the basis of at least 4 wobble units; and b) modulating the pre-coded wobble data and alternately recording the modulated wobble data on both sides of a land and/or groove of the optical disc.
In accordance with another aspect of the present invention, there is provided an optical disc, comprising: signal tracks of a land and a groove, in which wobble signals are alternately recorded on sides of the signal tracks, wherein the wobble signals are modulated and recorded so that a phase of a wobble signal recorded on a side of the signal track of the groove and a phase of a wobble signal recorded on a side of the signal track of the land are not consecutively repeated in anti-phase.
In accordance with yet another aspect of the present invention, there is provided an optical disc, comprising: signal tracks of a land and a groove, in which wobble signals are alternately recorded on sides of the signal tracks, wherein the wobble signals are modulated and recorded so that amplitude of the wobble signals recorded on a side of the signal track of the groove and amplitude of the wobble signals recorded on a side of the signal track of the land are not consecutively repeated while the amplitudes are different.
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
Now, preferred embodiments of a method for recording wobble signals on an optical disc and an optical disc on the wobble signals are recorded in accordance with the present invention will be described in detail with reference to the annexed drawings.
The pre-coder 30 pre-codes bit data of the address information to be recorded on the optical disc on the basis of at least four wobble units, i.e., wobble units of (2n+2) (n is a natural number) wobbles or more. For example, where address information is pre-coded on the basis of 16 wobble units, address information “0” of one bit is pre-coded to “0000000100000001”. Address information “1” of one bit is pre-coded to “0000000000000001”. In another example, the address information “0” of one bit can be pre-coded to “1111111011111110”, and the address information “1” of one bit can be pre-coded to “1111111111111110”.
That is, when the pre-coder 30 pre-codes bit data of “0” and “1” on the basis of 16 wobble units, two pieces of the pre-coded data corresponding to the address information “0” and “1” have only one different bit of 16 bits and the remaining 15 bits having the same bit data as each other.
Where the address information “0” of one bit is pre-coded to “0000000100000001”, and the address information “1” of one bit is pre-coded to “0000000000000001”, the modulator 31 outputs a modulation signal of the BPSK method corresponding to the data pre-coded on the basis of 16 wobble units as shown in
Modulation signals corresponding to pieces of the address information “0” and “1” have an anti-phase signal corresponding to the different one bit, and in-phase signals corresponding to the same 15 bits.
For example, where pieces of address information of “10001000” are pre-coded on the basis of 16 wobble units and data pre-coded on the basis of 16 wobble units is modulated and recorded by the BPSK method, modulation signals with no consecutively repeated anti-phase signals are alternately recorded on sides of signal tracks of a land and a groove as shown in
Accordingly, as described in connection with
As shown in
Pieces of the pre-coded data corresponding to bit data of “0” and “1” modulated by the modulator 41 have same amplitudes of in-phase signals except for one different amplitude corresponding to one different bit. For example, where address information “10001000” is pre-coded on the basis of 16 wobble units and the pre-coded data based on the 16 wobble units is amplitude-modulated by the ASK method and the modulated data is recorded, ASK modulation signals with no consecutively repeated zero-level amplitudes on the rewritable optical disc as shown in
Accordingly, where beam spots of an optical pickup are appropriately arranged on both sides of the signal track of the groove, wobble signals formed on both sides the signal track of the groove are in phase and have the same amplitudes, and a push-pull signal having an amplified signal level of a waveform corresponding to each wobble signal is outputted. A digital wobble signal is detected as a sliced push-pull signal, and a reproduction RF signal of a zero level is outputted.
As shown in
As apparent from the above description, the present invention can prevent the case where wobble signals, recorded on sides of signal tracks of a groove and a land, in anti-phase are consecutively repeated. Further, the present invention can prevent the case where wobble signals, recorded on sides of signal tracks of a groove and a land, having different amplitudes are consecutively repeated. Accordingly, there are no consecutively repeated zero-level sections in a push-pull signal, thereby minimizing performance degradation of a wobble PLL and a noise generated in a reproduction RF signal.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
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